Two circles, having their centres at A and at B, touch externally at a point M. From a
Two circles, having their centres at A and at B, touch externally at a point M. From a
point P on a tangent at M, tangents PQ and PR are drawn to the circles with points of
contact Q and R, respectively. If AP = 13 cm and AM = 5 cm, find the value of PQ + PR −
PM.
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Correct answer: (A) 12 cm